Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 2: Quantum Gases (Bosons) I

Q 2.5: Talk

Monday, March 14, 2022, 15:15–15:30, Q-H10

Supersolid phases of ultracold bosons trapped in optical lattices dressed with Rydberg p-states — •Mathieu Barbier, Henrik Lütjeharms, and Walter Hofstetter — Institut für theoretische Physik, Goethe Universität, 60438 Frankfurt am Main, Germany

In recent years Rydberg-excited bosonic quantum gases have emerged as a promising platform for realizing quantum phases with broken lattice translational symmetry, such as density wave and lattice supersolid phases. Although numerous theoretical works on trapped gases dressed with Rydberg s-states have predicted these phases, their experimental observation proves to be difficult due to challenges such as scattering processes and the limited experimentally achievable coupling strength. On the other hand, the less investigated case of Rydberg p-state dressing possesses advantages in this respect. We therefore study the quantum phases of an ultracold bosonic quantum gas trapped in a square optical lattice and dressed with Rydberg p-states, going both beyond the weak-dressing regime and the frozen regime. We consider an extended Bose-Hubbard model and compute its ground state phase diagram within Gutzwiller mean-field theory. We obtain Mott insulating, superfluid, density wave and supersolid regimes within the parameter space considered. Furthermore, through comparison with the ground state phases of bosons dressed with Rydberg s-states, we find the anisotropy of the long-range interaction to be beneficial for the coexistence of a condensate and spontaneously broken lattice translational symmetry, which is promising for realizing supersolid phases.